Mechanical stoker.



GVB.' CRAMP. MBGHANIUAL s'ToKnn.

' APPLIUATION FILED MAY 2, 1912. 1,066,254. Patented July 1, 1913.

4 annua-sum1..

G. B. CRAM?.` MECHANICAL STOKER. APPLIoATIoN FILED MAY 2, 1912.

4 'anims-SHEET 2.

' w/mfssfs j l ulm/Tof.'A //M 5505655.' @W1/wg a. e. 91M f8 Arromvfrs Patented Jly 1,- 1913.

G. B. GRAMP.

MECHANICAL STOKER.

I APPLICATION FILED une. 1912. 1,066,254. 1 Patented July 1, 1913.

' 4 sIInnTs-snnn'r al G; B. (JR-AMP.` MECHANICAL STOKEE.

APPLICATION FILED MAY?, 1912.

Patentauuly 1, 1913.

if yf l' {WE/won fuffa/55655445 TTUHNEYS tion with the feeding means foi-...breaking up- I To all whom z'-'m'ay concern Be itkn'own t'hatI,

cation. f.'

GEORGE BERKLEYQRAM, or HARRIS-Bund; PENNSYLVANIA.

Gnonon B; Cnam@ av citizen of thefUnited States, vand a' 'resident' State of Pennsylvania, have inyerllted..ain and vuseful Improvement,- Mechana Stokers,"of which the followingisaepeoi" ll'ly .invention chanlcal stokers, and has for ite-objectthe provision of a device' oftheharaoter spec1 tiedwherein means is providedfior paesing the'. fuel through the furnace. at speed that" 4 ``."fwill permit the fuel-to be consumed, and.

wherein means-1s also provided in conn'ee-y.

i i andseparating the burning .fuel as it' travels-,n

1n" order to permit the greategt possible amount to be converted into heat, and to pre# herence of the fuel 'and the 'grate bars;

Ventt-he formation off clinkers. andthe ad waste products ito A further object 'is to provideja' Stoker i wherein the grate bars will bemoyfed from the front of the furnace tothel rearin one` 1 plane, and from the rear to thefront ina lower plane,

and wherein the Said barshwill' be given' a rela-tire morement verticallyas they -move forwardly to tliioroughly felice and break up :the fuel, andfwherhein thefuel AWill be distributed uniformly and evenlyon .i the grate'a'nd the tinecoal will be held until it cokes and adheres to the larger/Size. f

-A 'a frontview oit positions A; further object is toprovidea `device njherein the grate bars; may-be renewed` without the necessity ofastoppmg-the, operationv of the Stoker, or slowing theoperation' thereof` andfwhereinthe first cost WiL relatively small and the operation' economical, both 'as concerns the operating parte and the operation'.

ln the drawings: Figure 1 is a side View of' a furnace provided with the improvenient:V Fig. 2 ie ahorizontal-Se'otion; Fig. 3 is a longitudinal vertical section; Fig. 4 'is the furnace; Fig. 5' is an enlarged partial side view ofthe grate Figs. 6, 7xand S are front, 'planland end views reepectirelyof the grate'bar;. and F 9 to 12 are diagramu'latic sectionsof adjacent grate. bars showing the different taken by the lugs as -tli-egrate harstravel. from front to 'the rear-oit' Athe grate.A

In the present embodiment of the invention the 'furnace may he of any usual conx y 'Specification till-"Ie e: Appueatieii'fnea- May'2,1912

is, an improvementfi-n jmeis arranged at -each'end oftheshaft.'

-n'ill be moved 1n the' same' manner, and

efruct'ion, as may also the boiler 1,y and the' extending end ofthe-' stokeratfthe lfqonlffofithe boiler,

the. ,containenjInclinedjdefectng'plates 5 1 and are .arrangedlin 'the bottom of; `the container, forming species -of'hop'per loot-- tom, -havln'g an openingrdrectly vabove the.

outer 'end lofthe, stlnferf` j The Stoker coinprisesfa-pair ofi, shafts '7 and 8,5 journalecl .one "abovef'the other, .in

bearings stands 5 'of the urnace.

'9 b'llill':y in the sidewalls. 10

vprovided with two-.paire of .ecoent'ries or ycams 11 and '-11a and12 and 1 2a,-respecti vely, thel pairs ofi eachl shaft bein'gfoppositely arranged, and the members of .each-pair bethe eccentrics 11 offshaft 7 have Each of the vShafts- 7' andv S ing at-opposite. endsvof theslaft. As, for' instance,

their point of greatest' eccentricity directlyl'opposite.the point 'of greates'teccentrioityfof eccentrics i12-and .one memberofeaoh pair same 'arrangement applieato thefccentrics' 12 Zand 12aof Shaft 8.v

j ,a Supporting frame-fer acabar-fdr aofagj! ing'the grate bars is l operated by` each ecc'en' g tric,l and lfour of the rack bars. 'are-provided'f -for each shaft 7 and 8." Each ra'ckjbarhas" a. Vsectional bearing 13 'orl-engagingzan'eccentric, and each-:ofthe rack bars 14 and 15 fon eccentrica` 11 'and' 12 has its front-end conneoted to' a plate 18 secured to thejfurnaee lfloor by bolts 19.'. .The-eonnection is bye platet.

E'aclrof the bars-- 14,i a1'rd'v15ai for the eecentrics Illl and 12; has its vouter endv similarly 'connected 'tol a plate 16 secured .to 'the furnace oor at the-front thereof by bolts 19a. Links'QOa" connect the rackb'a'rs 14ato the plate, and` links 21 connect Vthe rack bars 15.v On account of. the above de- -seribed'connect'iom the racklbars14and 15 the bars 14l and llfwillalsogbe moved in the 4same -I nanner, butv in the opposite direction to bars 14 and 15.l v

. It Willbe noticedxkromwan' inspection of Fig. l thatl theends of the links 20 and 21' are oilset laterally from each other, and that the plates 1G to which they are secured are near the furnace Wall, instead of being directly belou7 thezgrate bars.

The rack bars 14, 14a, 15 and 15 are of similar construction, and each bar is provided in its upper edge with spaced notches or recesses. The notches or recesses are rela.- tively 'wide as compared. with *theirv deptln and the bottom of eaclirecess is straight or plane,'and.the side-walls are inclined in- Wardly toward the bottoni of therecess.

The bottoms ofthe notches or recesses of 'the'lowe-r rack bars 15 and 15a are in ape proximate alinement. and the said notches v or recesses are alike'thronghout the length of the rackbars. lThe distance froniccnter to center Yof the said notches is exactly equal to the throw of the eccentrics. The notches of the upper rack bars 14 and 14151 are not alike, however, throughout the length vof the har,l butare arranged in three series Q4, 24?' and Q41 (Fig'f). ,A y The notches of series 2e, which are at the outer or forward end of the rack'bars, have their bottoms inclined downwardly toward approximatelyhalf their width, as shown at QG, and the rack bars 14, 1112.15 and lsengage the grate bars 1n the notches.

The notches f re of a depth correspondA ing approximately to the Width ofthe rack bars and at eaclrof the said notches theA grate barsl are' flanged laterally at both sidesg at both thebottoni and end ofthe notchese as shown at- Each grate bar is'also provided at its upper edge with series QS and I 2S- of laterally extending` lugs, the lugs Q8' extending` on one side of the bars andthe Alugs Q82 on `the other side.

, its shown in Fig. T, the series QS of lugs is staggered with respect to the series QSE, andV cach of the lugs QS is detz'ichably connected to the grate'bar by means of bolts which are passed through the bodies thel bars and through dependingV lue- 30 on the lues 2.33. The bolts are engaged by nuts 31, and a cotterfpin is passed through cach bolt to. hold the nutI from turning. .A

The heads of the bolts are received in the countersunk ends of the openings through which they are passed, so that the said heads the lus.. l2S of the adjacent bar, and

Y s 4The shafts 7 and S are provided at one end with vworin Wheels 11 piyoted on the shaft. vthe elbow lever is vpivoted to the lower end are flush with the surface of the bars. ililieii the grato bars are in place on the rack bars, 'a of`each bar fit between the lng-s l uliar in of the notches Q-l, Qi and 15 provides for relative increment of the grate hars in a rertical direction.

The lejrate bars are arrangeiil transversely 'of the furnace` and thosaid bars are of such length that their ends extend beyond thc ack bars, in order that the said ends' may be engageiil by the transferring devices, to be described, at. each end of the said rack bars. The upper edges of the rack, bars are rounded,as shown inliig. G. i

and 235 respet'ftir and the said Wheels engage a common Worin shaft djournaled between the Wheels in bearings 'on brackets 38. The shaft 3G rotated by means of a ratchet Wheel SS) sec'ured' to one end of the shaft. and encased by a pand et() on one arm of an elbow The other arin 'of of a link L12, Whose upper end is connected to the piston rod #f3 of a piston (not shown) in @a cylinder-1l, held in a supporting frame.

45 on the outer face of the furnace side wall. The` cylinder is supplied ivitlrm-otire fluid from the boiler by means of pipes d6 and et?, the former having a valve -18 for controllingr the same.

Each of the shafts 7 and S is provided with a crank arin 49 and 5C', respectively7 at its opposite end, and each ofthe said arms is connected by a link 51 with the transferring mechanism at therear of the stoker for transferring` the grate bars from thc rack bars' 1l, 1st to the rack bars 15, 151. The said mechanism comprises a shaft 52 join'- nalcdtransversely of the Stoker in bearings 53 in the furnace walls. i. crank arm .is secured to one end ofthe shaft7 and each of the links 5l is provided p'ith a longitudinal slot for engag'iiui` the outer end of the a'rin. rthe bearings 53 are integral with a triangular face plate 5G which secured to the outer face of the ira-ll by bolts 5T and :the bearingextends `into an openingl in' the.

Wa ll. An arm f8 prorided with alien-ring" slce'rc for engaging the shaft is arranged near cach end thereof, and each hcarinj leere is keyed tothe shaft (Fig. 2li. lach ariu is provided with a notch or recess 59 ai itstree cani and on its upper face for receivingy thc cud of the grate bar, as shown in the said Fie'. il. lihe shaft is oscillat'cd to more the grate bars by means of the-links 51. siinilai' transferring mechanism arranged at the front ends of the frames or bars, the mechanismcomprising a shaft GO jourinnctY in bracket arms Gl. extending outwardliv from the front of the nprights (572, which 40 downward movement. beyond alinement Withand links 64 connect the arm to Wrist'pins 65 innevata support the `fuelcontainer The Shaft is provi'dedwith a crankl arm 63 at one end,

and 65a on the respectiver Worm Wheels-49 and 50=before mentioned.

nach' link ei is iongitudinany"sneed n. its outer end, asshownat 66., forlengaging the crank arm, and-the said'links 64 are slidably connected to -thegcrai'ik-arm, as arejalso the links 51 to the crank arm 54'.' In` both cases the slots engage and are slidableona- Vheaded pin` on theend of the crank arm. An ar1h67 provided with a bearing sleeve for engaging-theshaft is arranged near each f end thereof,each sleeve heinglteyed to the shaft, as shown in Fig. 3.

y The arms '67 differv somewhat from the 4arms 58, in that each arm- 67 is sectional,

having a movable portion169 fpivotedto the:

end ofthe arm, the said movable portiony having the notch 71 for thegrate bars corresponding to the notch 59 of :the arms 58.,

Each portion 69 has a pair ofears orflu-gs 7 2l engaging opposite faces of the arm, and bolts 70 are passed through ears and arm 67 to pivotally connect the said portion and arm. Thesaid portion 69 -is provided with a linger v73 extending .transversely of the main portion 67 of the 'arm beneath the sameto limit'the downward swinging of they portion '69 With'respectitothe said main portion to aposit-ion iny alinement with the said main-portion. One of the-arms-G? is pro-v Lvided. with afdepending perforated lug 742 for receiving a link 75 which supports a plurality of Weights 76.

' The provision of the finger-'makes a rule l joint'betweenthe sections of the arms, permitting the portions 69 to swing upwardly with resnect tothe portion 67 but preventing the said portion v67. The Weights 76 insure.

the return of the arms t-o their normal posi-i tionwvhen they have 'been moved by they operating mechanism.

4 is provided' with avi The fuel container movable portion 79at itslower end in the! `form of a frame encircling the said'lo'werl end. A Aplate orv door` 77 is arranged belovvi the deiiecting plate 5 in inclined .positiomg and a shaft 78 connects ythe plate 77 andthe;

movable portion '7,9 tothe fuel .containen The shaft is .passed through bearings on'the container, and through bearings 90% onthedoor.-

E A second plate or 'door 8O 1s arranged mi inclined position beloW'the rear 'delectingfd plate 6, and the said plateor door is pivot'edf intermediate its ends and on a transverse axis to the frame, as shown in Fig. 3. The plate has bearings 82 Nat each end,l and a.' shaft or rod 81 :is -passedzthrough the bearings. The said-plate is provided .with a. 'oross'bar 84atfitsnpper end on the face adjacent to plate=6. 'lfhefframels provided.

(Figs. 9 to 1Q).

at-eacn side vvith a roller 8 5 (Fig. 1) and each of the rollers travels upon a trackway 86 secured-to the outer face of. the adjacentrack ,bar .14. t

The' free edge of the-plate 77 is inposition `just above the grate barsas they begin to move rearwardly on the upper rack bars, and

each .time "that the rack bars 14 move up- Wardly `the rollers are lifted and also the movable portion of the' container to insure 'they proper feedingo'f the fuel.

The shafts r(and Sare rotated by means of the cylinder. -f- Every time the piston moves upwardlyftl ratchet Wheel is' partially rotated. 'the leccentrics turn, a. .four-feed movement is imparted to the grate Y barsf the feed closely resembling that of an lordina'ry sewing machine. l

On the upper run of the conveyor com. prising the raclcbars lll 4and 14 the gratebars pass beneath the feed in inclined posiytion on account of the shape of the notches in series 24. Eachgratebar is inclined, the

llugs at one -side being .at a. lower level. at

their free ends than the lugs at the other side at their freeends. As the bars 14 move downward from 'the positionof Fig. 3, the

grat-e bars are lotv'ered, until they meet'rack bars 14a Which are moving upward. The` grate bars arealso moved rearwardly by the rack-bars 14, so that they slowly travel rear- Wardly as they are passed from one pair of vrack'b'ars 14f-to the other 14a.

AThe position ofthe grate bars at Vthe front of the Stoker prevents the dropping of-:the line coal through the. bars and also assist-s in the even and uniform distribu ico tionof the coal over the bars. "As the grato l bars reach the series 221 .of notches they as.-

sume l-a'vertical position,l with the upper edges ofathe lugs-28 and 2S inethe same' plane. Just, infront of the eccentrics t-he notches of series24l commence.

The side`-faces of the lugs 2S and 26a of t-he grate bars are beveled lin opposite direc- `Wider at their tops than attheir 'bott-oms From this construction results that when the grate .bars are tilted ror inclined. forward, `as -at thej'front of the stoker,.thewide topsof lugs 28 are near the `wide-' ho-ttoins of lugs QS., and a close mesh- .ing of the lugs results (Fig. 9).

rt-hus continually stirred and. sliced, and

tions, the lugs 2S being Wider at vtheir bot- :toms than at theirtops, While lugs 2t P are smoved rearwardly one notch. Ak the ene-Ls {bestias-grate en the uppe reel; "ears in au'elmoved ivea'wm and hehave. en' ille lower radi bays are. moved 'ferwa'f`3n The gl'ae mais ae passed from-mel; bers 14 toraek bars l5 on `the -xppe run of 'the een- Veye, m on therjpassage rem one pair. @f -rack'bars to the olherhe genie bers ef the rack bers the grate ybars ae' 'mls eredrem the. l'ppe bars is 'the lewe? e by .meanso the aims 5S en@ the arxengemen the rack 535 'pvoed at one end and *free at he ether an 'meved at a,- pent ne'medate ''i @n-s; a 'pecuar mow-'ement is impared te the bvs. Thatfs, each me is moved upwavv, yes. Wardly, ewnwady and iowe( E ai each"v fmmpee retaton o the eeeelit'e comleeed therewith. The ,erase bars are also' mover?, 'in 'lhis ma-nner, but as they ss from (me set of bars te he ber the xv'eztce'i weve nient is 'not s0 umrked as hm, of ibex-nek g5 bars.' The grate bersmove re'mmu'dly wish ene paire?? mak bars im@ 'f7-LOW n im? eeran extent, au are Jrhen tumsferred the Q-hef pa' of bars which we waving up- 'Wardlyg and are again moved, ler'wady,' while the first s e'tvoof rack 'hars is moving i forwardly. n :,oup The arms 58 are operated by @he links 51, men Q one-f Whch'ispon'neeted 'ro each ssa'- Z and S. .The arms are. lifted i@ receive each grateybr, first by (me link am the-11 'ey the ether, and as soon as taegrfztem on 'T arms they are lowvered or' moved dovm A '$120 shift the grate bal to the lever' aek bacs. The parts are so :u #het mei; Y

again'move downwardly and the movable 69 may Aswing upwardly, so .that will not interfere with the foremost grate bar on rack bars 15a. As'tlie arms. G7

aremoving downward, rack bars a are rising, with a grate bar, and on that account A, thearins v(S7-must .be constructedas shown,

in order' `that the rising 'grate'bar `will not *Y -interfere "with :the said. arms, The grate Il() j Y from front .torear vofthe furnace, and from bars are thus' moved lijn la stepwisel 'manner stokerthe gratefb'ars-at-fthe .front of. thefurnace are in their; closestposition,with' the lugs arranged to-make as'nearly van' iin-.- l, perforate holder as .possiblei'As' they move.

v.rearwardly they .are separated to permita largerquantity of air to, pass, ja-ndfasftheyl near the center of the furnace the gratebars are so arranged as to break up and aslice the burning fuel to insure complete combustion.` The feeding mechanism at "the front of the furnace insures that' theffuelfwill 'be 1 'evenly and uniformly distributed over lthe grate bars, and that the fuel will be fed continuously-and not by jerks, first a large amount, and then a small amount, or none i at all.' 'Ali-defective grate bar mayJoe-'res fic stoken o f the pairs, links connecting the front .ends

0f 011e pail Ofupper rack bars andone pair` of lower rack bars to the plates at the 4'front of the grate, links connecting the rear endsl of the other pairs to the plates atthe'rear.

of the grate, upper and lower shafts4 journaled transversely of the grate .intermediate the ends of the rack bars, yan eccentric for` .each upper rack bar secured to theupper` shaft, an eccentrlc for each lower rack, bar4 secured to the lower shaft, a bearing intermediate the ends of each rack bar, each' bearing engaging an eccentrlc, the eccentrica- Q;

gresjS 'effe d Vlower" of the rack. bars connected at their front ends being oppositely arranged tothe eccenftrics of the rack bars connected -at'their rear ends, means for intermittently rotating the shafts `at the same speed 'in opposite directions, a plurality of grate bars, each grate ,bar having oppo-sitely extendingflanges at its lower edge for engaging the rack bars, each of the said rack bars having its upper edge provided with spaced notches for en` gag-ement by the said ends, the notches of the lower rack bars having .their bottoms in approximate alinement, and the notches of -the upper rack bars. beingarranged in three- WiSe-la -1 of-'au' plu lity frars 'being' appris. mately-.Parallel .und ar-- ranged at ,opposite sides of the" grate, aplate series, the members of the series at the front i ends of the said bars having their bottoms inclined downwardly toward the front lends thereof, the notches of the f second series having their bottoms in alinement, and the alternate not-ches of the third series being of lesser depth than the intermediatenotches,l

each ofthe said gratel .bars having oppositely extending series 'oflugs at each side the'reof, the' lugs of one Series being staggered with respect to the lugs of the other series, andthe side'edges of the lugs of one series being beveled in -the opposite directionto thes'i'de edges ofthe other series, and :means at each end ofthe rack bars'for trans.1

bars "tothe other ser.,

124A mechanical Stoker comprising a progressiveifeedg'ratecomposed of upper and lower.v sets of l,rack bars, each set lcomprising f.;'.pairs,' the members-of the pairs beingfarrangedin spaced relation, a'

plate. arranged .adjacent to each end .of each4 Ofthepairajilinks connecting thefront-'ends ofon'e pair of upper rack bars and onepair of llower.rackbars to the plates4 at the-front j 4 ofthe grate, links connecting the rear ends4 'of the other pairs to the plates at the rear of .thegrate, upper and lower shaft-s journaled transversely of the grate intermediate j the ends of the 'rack bars, any eccentric for each upper rack bar-secured to the upper.

shaft, an eccentric for` each "lowerv rack. bar

mediate the'ends ofeach rack bar, each bearlsecured tothe lower shaft, bearing inter# ingengaging an'eccentric, the eccentrics of the rack .barsl connected at their front ends belng oppositely 'arranged -to the eccentrics of the rack bars connected at their rear ends, means for intermittently rotating the shafts at the same .speed -in opposite directions, .a

plurality of 'grate. bars, each grate bar. having' oppositelyextending flanges at its lower edgefor 'l engaging the-'rack'4 bars, each of.

lthe-said rack bars having its upper: edge providedwith l spaced notches for engageend .of the gratel fe rr i ng."the grate bars fromz'one .setfo ck-barsto the other `o pairs, the membersof the ment fby .thej said ends, and .means ateach 3.' ilkmechanical gstoker' comprising Ia pro'- .grate composed L Qf'upper and fifrackfbars,.eaehfsetconsisting ,I

lof the'grateg-ra link connecting fthe front ends Y jof Vone' pair 'of-.uppeif'rac'ltbars and one. pair .of 'lower rack bars to the plates-atftne front f of the grate,'links. connecting the-'rear ends.

ofthe other-'pairs to theI plates at th'e rar of the grate, upper and lower shafts journaled transversely of .the grate intermediatev the endsiof the rack bars, an .eccentric on the upper shaft for eachupper rack bar, an

eccentric on the lower sha t for each lower rackbar, a bearing on each rack bar for -engaging an eccentric, the eccentrics of the first-named pairs of rack barsbeing Oppositely arranged tothe eecentricsof thelast' named pairs of frame bars, means for intermittently. rotating the shaftsat the saine speed in opposite directions, a plurality' ofV grate barsthe rack bars having notches for receiving the ends of the' grate bars, and means at each end vof the rack bars for transi 'ferrino lower sets of rack bars, each set consisting of a lplurality of pairs,tlie members of the pairs beingarranged in spaced relation, a..

linlrpivotally connecting the front ends 'of one'pair of upper rack bars and one pair .of lower rack bars tol the bottoni of tl'iejfurs4 nace, links connecting the rearends of 'the other pairs of rack bars to the'bottom of the' furnace, means for imparting a vertically oscillating and endwise reciprocating move-4 ment to. all of the rack barsand for causing the-first vnamed pairs of bars to move in the opposite direction to the last named pairs, 3o'

i sitely.extendingflanges at its ends, each of' v-fsitezdlrectio'n to the side edges of the lugs a' plurality of grate bars eachj having oppotlie rack bars-having its upper face provided with spaced notches for engagement. bythe saideiids of the' grate bars, and means at each end of the'grate for transferring the grate bars from one set of rack bars lto the others'etjf A mechanical Stokerv comprising a'progressive-'feed'grate composed of`- :L -.plurality of vgrate 'bars `arranged transversely ofthe grate, upper and -lowervsets of'frame' bars, each having a' notched'upper surface .for engagement b tliegrate bar's,'th e rack barsof 'each' set being arrangedin pairs, a shaft journaled transversely of each setof ,raclr' bars intermediatetlieends thereof, means on each shaft for vsimultaneou'sly imparting avertic'ally yoscillating and en dwise reciprocating movement to the rack bars and `follgconstraining one 'pair of each. 'set t niov-y in the opposite direction to the other vpair of the set, means :for rotatingA the ishafts in i V opposite directions 'andatequal speed, and' means at each endof' the; grate-for 'transf'a ferringythe' grate 'bars from one .set to the other`, said means comprising a shaft ar ranged transversely of --tlie grate'at eacliend- `thereof, each shaftha-ving arms-extending I rotationf'of 'the first named'shafts, the arms toward the rack'bars, a connection between each of the first named shafts and Aeach of the; lastnamed L shafts for oscillatingthe said-lastnamed shafts vonce during' each d 'ontheshaft at the fro-r Lof thegrate-being getl'ier for swinging movement upwardly with respect to qeach other.

6.5 A mechanical stoker coiiiprisng a progressive feed grate composed of a' plurality of grate bars arranged transversely of the grate, upper and lower sets of rack barseach having a notched upper surface for receiving the grate bars, the rackbars of each 'set 'being arranged inpairs, means for simultaneously imparting avertically os-..

cillating and eiidwis'e reciprocating movement to each vset of rack bars and for con'- straining one pair of each set to move iii the opposite direction to the other pair of the set, means for' intermittently operating the said means' in opposite directions', and means at each end of the 'rack bars for transferring the grate bars from one set o f rackbars-to the other set. '2'.V A mechanical stolreicomprising aprogressi've feed grate composed of a plurality Jecting'spaced lugs'at-its upper edge, the

lugs of one series being staggered with' respect to the lugs of the other series,- thelugs' of each series having their side edges beveled, the' .sidev edges of. the lii-gs of oneseries being'bevelcd in the oppoof the other series, means for moving thc said grate bars in spaced relation from the front to the rear of 'the grate and with the lugs of each bar extending between the lugs of the` adjacent bars, said moving means -liavingf means for supporting the grate, bars with the lugs inclining downwardly at the "front ofthe grate bar the said grate bars pass below1 the 'feeding means and for sup! porting the grate bars with the lugs at apthe intermediate grate bars-for the remainder; of Vtheir travel to' the rear of vthe `proximately the same level as the grate bars yenter the furnace vand for supporting the' 'alternate grate bar s at'a higher level than 110- grate, means below the first named' lmeans gressive feed gratecomposed'of a plurality of grate-bars arranged transversely of the the-saidnmoving means to tliebther of the grate', fuel feeding means at' the front of the I grate, each of the said grate bars liavi ng op- 'positely 'arranged 'series of 'laterally projecting spaced lugs at its upper edge, the lugsof one series being staggered with' respect tot-he lugs fof' the other series,- means for moving. thesaid grate bars insp'aced relationfrom the front to 'the `rear of the grate gressiieffeedfgrate.composed '0f grfbhs]@remede-trans 'grabmfuel feedingmeans'at-the frbntjof the grate, each of the -s'aidlg'rate iba-rs havingop'- positely 1 v'arranged '-ser'ies -'olv .laterally --pro- .jecting. 'spac'ed'lngs; the lugs of, onelseries' the grate,and means; atjeachend aid moving means for .transfelr grate.

bars from"- onefofthef salgdmov1ng=means to Locmaria 2 and With-the lngsofeach bar attending be.-

y tween the lugs ot the adjacent bars, sai-d movlng means 'having means-for supporting the grate bars with Athe lgs ineliningdown- .wardly at the front of the-.grate barj'as'thelsaid. grate bars pass `-below-the.feediniri means and for vsupp orti'ng f the grate* balSz-.f with the lugs at' f approximately'fthe same. levelas the grate .barsaenter thef for' supporting the alternate`-grate bars. ata bars for the l remainder* off-'th spaced relation from thefrearto-the'rnt of the 4vother. ofthe said movingmeans.. 19. n i'echanica ll Stoker Comprising.- al. prol plurality f being-.staggered with respect tothe llrg's of the other series, .means for moving the said grate bars' in spaced relation from the front spaced relation'from-the rear to the front tothe rear of the grate, said moving means having means for supporting t-he grate bars -With thelugs of the adjacent bars inten' meshing, and with the lugs inclining` downwardly at the front'of the grate bar as the said grate bars passjbelow. the feeding means, and for supporting' the alternate grate bar slat a higher level than the intermediate grate bars as they morer toward lthe rear of the gratdincans below the first named means for moving the said vbars in of the grate, andmeans at each-end of the said moving' means -for transferring the means,

grate bars from one of' the said moving means, to theother 'of the sald moving 10. A. mechanical stoker comprising" a progressive feed grate composed of a vplurality of grate bars arranged transversely' ofthe. grate,A fuell feeding' means at the front ofathegrateyeach of the said grate bars hav-f.

ing' opgpositely arranged serieso'f laterally v.eextendiineg' lugs, 'means for moving the said grate barsin spaced relation from the front to therear of theV grateandffor support-ing the saidfbarsivith vthe lugs ol' the adjacent bars. intermshing, and with the .sa-idglugs in spaced relation .fromthc rear to the front vv'grate for.A transferringfthe vof the grate, and means ateach-.endijqf @he one of thefsaid moving-means ther of the saidinoving means.

11; In a. mechanicalstokeigi gres'sivew feed gratecomposed of a'plnrality-.ofkrate lugs .at its upper-edge, fthe vli-igs of one .series 'bars arranged transversely offtliegrateg :feeding means' at the ront-loffthe-grltegeaeh of the said grate bars having'ffopposit/elyy 'arl I angedseries of laterally 'projecting' 'spaced .being staggered with. respect-'to thelugs' of lthejotheriseries, thelugs of each series havingtheirside-edges beveled', the side edges n fof-the: lugs of one sries-being beveled Ithe 'opposite direction to .ftheside edges of the,

lugs of the other series,- means for moving fthe' said grate ybars from .thev front'to the 'rearof the grate and W ith the lugsof each bar' extending .between the lugs lof theads' jacentbars, said movin'gi means having'- -A means at lthe front thereoffforh'oldingjthe 3 'i gratel bars 'with the lugs inclined -dQWn- Wardlyl 'toWardthe-front'of the grate and having means at the rear: `tl'ieneo for. Sup- .190

porting the alternate gratebars ata 'higher level than the intermediate grate bars', and

mea'lis'ior returning the said-grate bars to the front of the grate. 12. In a mechanical Stoker, a progressives' feed grate com )osed of grate lbars-arranged transversely o the grate, each of the said/j,- grate Abars'having oppositely arranged se '.jj j

riesvof laterally projecting spaced lugs 'at its upper edge, the lugs ofone series beingjstaggered with respect to the"lngs of vthe opposite direction to the. side edges'of the lugs of the 'other..ser1es, means fo1.1nov1ng the saidv grate bars in spaced relation from the front to the rear of the grate and with the lugs of each bar extending between the lngsof the adjacent bars,the s: id moving I means ,havingmeans forholding the grate bars with the-'lugs inclining downwardly at1 ltherfront of the grate bars at the front of the grate 'andfor holding the alternate grate bars at a higher level than the intermediateggratebars at the rear of the grato.

and means-for returning the grate 'hars tot'lie'front of the grate.

v13. Ina mechanical `stoker, a' progressivo feed grate composed of a .plnralitv ol grate bars arranged trans\-'erscl of the Qi-alc. each.l of the said grate bars havingv oppositelyf arranged series ol laterally projecting.

spaced lugs, meansA for moving the said grate bars from the front to the rear of the .grate with' the lugsof each bar cxt-om'ling between" the lugs of the adjacent bars,4 the moving means' having means forholding the gratebars .with the front seriesof lugs at a `lower level lthan the r'earseries at the front other series,"the lugs of each'series having,"ff"- Y their side'edges beveled, the side edges bf f the lugs ofone series being beveled in the of the grate, and for holding the alternate 'and means for returning the grate bars to fthe front of the grate.

11d. ln a mechanical Stoker7 progressive feed grate composed of independent and deached grate hars arranged transversely of the grate; each bar having oppositely arganged series of lateral spaced lugs, means @disconnected from the grate bars and en- 1g gaging beneath the same for lifting and moving them 'from the front to the rear of the grate with the lugs of the adjacent bars intermeshing, means :for imparting vertical movement of the grate bars with respect to each other as they move rearwardly, and means for returning the said grate bars to thefront of the grate.

l5 in a mechanical stoler, a progressive feed grate composed of grate hars larranged transversely of the grate, a plurality of pairs of raclr bars for supportingthe grate hars, said rack hars having notched upper edges for engagement by the grate'bars, means for imparting a vertically oscillating and endwise'- reciprocating movement to the rack bars and 'for'.constraining one pair of bars to move in the opposite direction to the other pair, fuel feeding means at lthe front ofv the grate, and means operated by the movement ofl the rack bars for actuating the feeding means. i

lo'. ln amechanical Stoker comprising a roo'ressive feed grate composedv of independent and detachedgrate bars arrangedtransversely of the grate, each bar having oppositely arranged seriesof laterally projecting spaced lugs, means disconnected from the grate bars and engaging beneath the same 4for lifting and moving them intermittently from the front to the rear .of the the moving means having.

furnace in: spaced relation, the moving' means having means for imparting relative vertical movementto the grate bars', Jfuel feeding means at the front of vthe grate, and means' operated by themovement'of the moving means for thegrate bars for actuating the feeding means.

17. Ina mechanical Stoker comprising a progressive feed grate ycomposed of inde.

pendent and detached grate bars arranged transverselyof the.- grate, each bar having oppositely arranged series of laterally projecting spaced lugs, means disconnected from the grate bars and engaging beneath .the same for lifting and moving them intermittentlyjfrom the frontcto the rear of thev furnace inspaced relation the moving -mean's having means for vimparting' relative vertical movement to the gratebar's.

:18.111 a mechanical Stoker, a progressive feed grate `composed of disconnected grate bars arranged transversely of the grate in upper and 'y lower runs, means below the `upper-run forengaging beneath` the bars of the said-run, for 'lifting the bars and moving them from lthefront to the rear of the rate means below` the lower run for engaging and lifting the bars of the said run and moving them from the rear to the front of the grate, means at the rear of the grate for receivingthe' bars from the upper runand delivering them' to the lower run, means at the front of the grate for receiving the hars from the. lower run and delivering Vthem tol the upper run, the -moving means of theI upper run'having means for imparting relative vertical movement to the alternate pairs of the said run as they are moved rearwardly.v v y GEGRGE BERKLEY CRAMP.

vWitnesses: A

' B. L. ZIMMERMAN,

S.- E. PATTERSON. 

